One the build out costs lots of money and if the owner doesn't renew you've lost $60,000.
Two if you end up with a successful coffee shop/bar/etc the owner can squeeze you out of every dime of profit because it's disastrous to most of these establishments to move.
It means that there's just not a lot of demand for short term commerical leases. Exceptions are seasonal stores like a Halloween or Christmas store who are happy to sign a short term lease, usually at a discount.
Everything I've read about New York real estate has suggested that it's slowing down considerably and pretty buyer-friendly right now.
Granted that's mostly about residential real estate, but I wouldn't be surprised if it's the same with commercial as well, and would certainly explain the reluctance to sign short-term leases.
That would argue for being pretty happy about short-term leases, since they maintain that flexibility. But I don't really know much about this, I'd like to understand it better.